【作者】 张良苗； 陆文聪； 包新华； 殷文宇； 陈念贻；

【Author】 Zhang Liangmiao, Lu Wencong, Bao Xinhua, Yin Wenyu, Chen Nianyi (Alumina Research Group, Department of Chemistry, Shanghai University, Shanghai 200444, China)

【机构】 上海大学化学系；

【摘要】 应用FACTSAGE软件及其数据库,对氧化铝生产的碱石灰烧结法熟料烧成若干化学反应的Gibbs自由能和有关的多元相图剖面作了计算,以研究MgO和FeO在烧结过程中的行为。计算表明:在熟料烧成的配料中,用MgO或FeO完全代替CaO是不可能的,靠生成Ca2FeSi2O7的反应用FeO部分代替CaO在1300K以上温度亦不可能。但用MgO代替部分的CaO,使反应产物为Ca3MgSi2O8(或 Ca2MgSi2O7)和NaAlO2则是热力学可能的,另外,利用碳还原Na2SO4生成的Na2S和FeO,Al2O3作用,使其生成Fes和NaAlO2,以提高熟料溶出时氧化钠的溶出率,也是热力学可能的。更多还原

【Abstract】 Based on the computation of the phase equilibria in the sintering process of soda-lime sintering method for alumina production, the Gibbs free energy functions of a series of chemical reactions involving MgO, FeO and Fe2O3 were calculated. It is found to be impossible to use MgO or FeO to displace CaO completely in the sintering process. It is also impossible to form Fe2SiO4 or Ca2FeSi2O7 instead of Ca2SiO4 above 1300 K in the sintering process. But it appears to be thermodynamically possible to form Ca3MgSi2O8 or Ca2MgSi2O7 instead of forming Ca2SiO4 in the sintering process. It appears also possible to make Na2SO4 reduced by coal powder and to react with alumina and FeO to form FeS and NaAlO2, in order to increase the leaching rate of Na2O in the sinter leaching process.更多还原